redonkable/alistair23-linux
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IB/ipath: Fix check for no interrupts to reliably fallback to INTx

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Newer HCAs support MSI interrupts and also INTx interrupts.  Fix the
code so that INTx can be reliably enabled if MSI interrupts are not
working.

Signed-off-by: Dave Olson <dave.olson@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Dave Olson 2008-04-16 21:09:30 -07:00 committed by Roland Dreier
parent 1d7c2e529f
commit 9b436eb4f8
3 changed files with 42 additions and 22 deletions
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23
drivers/infiniband/hw/ipath/ipath_driver.c
View file

@ -138,19 +138,6 @@ static struct pci_driver ipath_driver = {
},
};
static void ipath_check_status(struct work_struct *work)
{
struct ipath_devdata *dd = container_of(work, struct ipath_devdata,
status_work.work);
/*
* If we don't have any interrupts, let the user know and
* don't bother checking again.
*/
if (dd->ipath_int_counter == 0)
dev_err(&dd->pcidev->dev, "No interrupts detected.\n");
}
static inline void read_bars(struct ipath_devdata *dd, struct pci_dev *dev,
u32 *bar0, u32 *bar1)
{
@ -218,8 +205,6 @@ static struct ipath_devdata *ipath_alloc_devdata(struct pci_dev *pdev)
dd->pcidev = pdev;
pci_set_drvdata(pdev, dd);
INIT_DELAYED_WORK(&dd->status_work, ipath_check_status);
list_add(&dd->ipath_list, &ipath_dev_list);
bail_unlock:
@ -620,9 +605,6 @@ static int __devinit ipath_init_one(struct pci_dev *pdev,
ipath_diag_add(dd);
ipath_register_ib_device(dd);
/* Check that card status in STATUS_TIMEOUT seconds. */
schedule_delayed_work(&dd->status_work, HZ * STATUS_TIMEOUT);
goto bail;
bail_irqsetup:
@ -753,7 +735,6 @@ static void __devexit ipath_remove_one(struct pci_dev *pdev)
*/
ipath_shutdown_device(dd);
cancel_delayed_work(&dd->status_work);
flush_scheduled_work();
if (dd->verbs_dev)
@ -2195,6 +2176,10 @@ void ipath_shutdown_device(struct ipath_devdata *dd)
del_timer_sync(&dd->ipath_stats_timer);
dd->ipath_stats_timer_active = 0;
}
if (dd->ipath_intrchk_timer.data) {
del_timer_sync(&dd->ipath_intrchk_timer);
dd->ipath_intrchk_timer.data = 0;
}
/*
* clear all interrupts and errors, so that the next time the driver

36
drivers/infiniband/hw/ipath/ipath_init_chip.c
View file

@ -665,6 +665,28 @@ done:
return ret;
}
static void verify_interrupt(unsigned long opaque)
{
struct ipath_devdata *dd = (struct ipath_devdata *) opaque;
if (!dd)
return; /* being torn down */
/*
* If we don't have any interrupts, let the user know and
* don't bother checking again.
*/
if (dd->ipath_int_counter == 0) {
if (!dd->ipath_f_intr_fallback(dd))
dev_err(&dd->pcidev->dev, "No interrupts detected, "
"not usable.\n");
else /* re-arm the timer to see if fallback works */
mod_timer(&dd->ipath_intrchk_timer, jiffies + HZ/2);
} else
ipath_cdbg(VERBOSE, "%u interrupts at timer check\n",
dd->ipath_int_counter);
}
/**
* ipath_init_chip - do the actual initialization sequence on the chip
* @dd: the infinipath device
@ -968,6 +990,20 @@ done:
0ULL);
/* chip is usable; mark it as initialized */
*dd->ipath_statusp |= IPATH_STATUS_INITTED;
/*
* setup to verify we get an interrupt, and fallback
* to an alternate if necessary and possible
*/
if (!reinit) {
init_timer(&dd->ipath_intrchk_timer);
dd->ipath_intrchk_timer.function =
verify_interrupt;
dd->ipath_intrchk_timer.data =
(unsigned long) dd;
}
dd->ipath_intrchk_timer.expires = jiffies + HZ/2;
add_timer(&dd->ipath_intrchk_timer);
} else
ipath_dev_err(dd, "No interrupts enabled, couldn't "
"setup interrupt address\n");

5
drivers/infiniband/hw/ipath/ipath_kernel.h
View file

@ -426,6 +426,8 @@ struct ipath_devdata {
struct class_device *diag_class_dev;
/* timer used to prevent stats overflow, error throttling, etc. */
struct timer_list ipath_stats_timer;
/* timer to verify interrupts work, and fallback if possible */
struct timer_list ipath_intrchk_timer;
void *ipath_dummy_hdrq; /* used after port close */
dma_addr_t ipath_dummy_hdrq_phys;
@ -629,9 +631,6 @@ struct ipath_devdata {
u32 ipath_overrun_thresh_errs;
u32 ipath_lli_errs;
/* status check work */
struct delayed_work status_work;
/*
* Not all devices managed by a driver instance are the same
* type, so these fields must be per-device.